/*
 * addword.c - 使用 fprintf(), fscanf() 和 rewind
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define MAX 41


int main(void)
{
    
    FILE *fp;
    char words[MAX];

    if ((fp = fopen("wordy", "a+")) == NULL) {
        fprintf(stderr, "Can't open \"wordy\" file.\n");
        exit(EXIT_FAILURE);
    }

    puts("Enter words to add to the file: press the # ");
    puts("key at the beginning of a line to terminate.");

    while ((fscanf(stdin, "%40s", words) == 1)  && (words[0] != '#')) {
        fprintf(fp, "%s\n", words);;
    }

    puts("File contents:");
    rewind(fp);
    while(fscanf(fp, "%s", words) == 1) {
        puts(words);
    }

    puts("Done.");

    if ((fclose(fp) != 0)) {
        fprintf(stderr, "Error closing file\n");
    }

    return 0;
}
